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-rw-r--r--missing_number.cpp18
1 files changed, 18 insertions, 0 deletions
diff --git a/missing_number.cpp b/missing_number.cpp
new file mode 100644
index 0000000..03dd331
--- /dev/null
+++ b/missing_number.cpp
@@ -0,0 +1,18 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ int missingNumber(vector<int> &nums) {
+ int sum = 0, n = nums.size();
+ int total = n * (n + 1) / 2;
+ for (auto number : nums)
+ sum += number;
+ return total - sum;
+ }
+};
+
+int main() {
+ Solution obj;
+ vector<int> nums = {9, 6, 4, 2, 3, 5, 7, 0, 1};
+ cout << obj.missingNumber(nums);
+}